Daniel's not the villain in the show. He's kinda the same as he was in the first movie- a mostly well-intentioned guy who's a successful businessman, and loving husband and father. He's just got a bit of a temper and can be self righteous and smug at times.
Johnny's turned into an alcoholic deadbeat dad asshole who slowly redeems himself over the course of the show. His brand of toxic masculinity is actually helpful for the 'losers' who join his dojo, but it goes too far towards the end and even he realizes it.
I guess that's a spoiler, but the major plot points and character beats are fairly well telegraphed.